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Replace CAS loop with single TAS in ProcArrayGroupClearXid()

author Alexander Korotkov <akorotkov@postgresql.org>

2018年9月22日 13:22:30 +0000 (16:22 +0300)

committer Alexander Korotkov <akorotkov@postgresql.org>

2018年9月22日 13:22:30 +0000 (16:22 +0300)

commit 2f39106a209e647d7b1895331fca115f9bb6ec8d

tree 5e0dfee59c3ce48a5cd6e5b804d250f8ef784df2 tree

parent db361db2fce7491303f49243f652c75c084f5a19 commit | diff

Replace CAS loop with single TAS in ProcArrayGroupClearXid()

Single pg_atomic_exchange_u32() is expected to be faster than loop of
pg_atomic_compare_exchange_u32(). Also, it would be consistent with
clog group update code.

Discussion: https://postgr.es/m/CAPpHfdtxLsC-bqfxFcHswZ91OxXcZVNDBBVfg9tAWU0jvn1tQA%40mail.gmail.com
Reviewed-by: Amit Kapila

src/backend/storage/ipc/procarray.c diff | blob | blame | history

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